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In Mathematics / High School | 2014-11-09

How do you solve the system of equations using elimination?

1. \(x - 4y = 11\)
2. \(5x - 7y = -10\)

Asked by cctaylor1491

Answer (2)

x − 4 y = 11 / ⋅ ( − 5 ) 5 x − 7 y = − 10 − 5 x + 20 y = − 55 5 x − 7 y = − 10 − − − − − − − − − 5 x + 20 y + 5 x − 7 y = − 55 − 10 13 y = − 65 / : 13 y = − 5
x − 4 y = 11 / ⋅ 7 5 x − 7 y = − 10 / ⋅ ( − 4 ) 7 x − 28 y = 77 − 20 x + 28 y = 40 − − − − − − − − − 7 x − 28 y − 20 x + 28 y = 77 + 40 − 13 x = 117 / : ( − 13 ) x = − 9 A n s . x = − 9 an d y = − 5

Answered by kate200468 | 2024-06-10

To solve the system of equations using elimination, first multiply the first equation to match the coefficients of x in both equations. After subtracting, you find y = − 5 and substituting this back gives x = − 9 . Therefore, the solution is x = − 9 and y = − 5 .
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Answered by kate200468 | 2024-12-26